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J = <a href="%pathto:imop.vl_imdown;">VL_IMDOWN</a>(I) downsamples the image I by half by discarding
each other pixel.
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<a href="%pathto:imop.vl_imdown;">VL_IMDOWN</a>() accepts the following options:
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Method
<span class="defaults">Sample</span></dt><dd><p>
'Sample' downsamples the image by discarding
pixels. 'Average' instead averages groups of 2x2 pixels.
</p></dd></dl><p>
See also: <a href="%pathto:imop.vl_imup;">VL_IMUP</a>(), <a href="%pathto:vl_help;">VL_HELP</a>().
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